caa a22 4500 397569653 CHVBK 20180308164837.0 cr unu---uuuuu 161202e199610 xx s 000 0 eng 10.1093/oxfordjournals.jmicro.a023463 doi (NATIONALLICENCE)oxford-10.1093/oxfordjournals.jmicro.a023463 In-situ TEM Observation of Phase Transformation Processes in Cu3Pt with a Long-Period Superstructure [Elektronische Daten] [Akiyoshi Matsumoto, Kouichi Matsuno, Nobuhiko Chiwata, Noriyuki Kuwano, Kensuke Oki] In-situ TEM observations were carried out for phase transformation processes in Cu3Pt. For the transformation process from L12−S to (Ll2−S + A1), the specimens of L12−S were heated in a microscope at 823 and 859 K, which are in the temperature range of (A1 + L12−S). It was clearly observed that the process is different depending on the annealing temperatures. On isothermal annealing at 823 K, the disordering started by the wetting of thermal antiphase boundaries (APB). On isothermal annealing at 859 K, major parts of the specimen became disordered in a few minutes with the remaining regions of the ordered phase growing afterwards. The kinetics of the phase transformations were discussed in terms of free energy of the alloy system. For the process from L12 to (A1 + L12−S), the L12 specimen was heated at elevated temperatures up to (A1 + L12−S). The observations clarified that the transformation process from L12 to L12−S proceeds by wrinkling certain parts of thermal APBs in L12. It was also revealed that L12 is not directly decomposed to (A1 + L12−S) but via a state of a homogeneous L12−S © 1996 Oxford University Press Full-length Papers nationallicence in-situ TEM observation nationallicence long-period superstructure nationallicence periodic APB nationallicence wetting nationallicence order-disorder nationallicence Matsumoto Akiyoshi Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut Matsuno Kouichi Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut Chiwata Nobuhiko Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut Kuwano Noriyuki Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut Oki Kensuke Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut Microscopy Oxford University Press 45/5(1996-10), 442-447 0022-0744 45:5<442 1996 45 jmicro https://doi.org/10.1093/oxfordjournals.jmicro.a023463 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/oxfordjournals.jmicro.a023463 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Matsumoto Akiyoshi Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut NATIONALLICENCE 700 1- Matsuno Kouichi Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut NATIONALLICENCE 700 1- Chiwata Nobuhiko Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut NATIONALLICENCE 700 1- Kuwano Noriyuki Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut NATIONALLICENCE 700 1- Oki Kensuke Department of Materials Science and Technology, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka, 816 Japan aut NATIONALLICENCE 773 0- Microscopy Oxford University Press 45/5(1996-10), 442-447 0022-0744 45:5<442 1996 45 jmicro Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford